Depth of investigation for multi-parameters inversions

G. Fiandaca, A. V. Christiansen, E. Auken

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review

22 Citationer (Scopus)

Abstrakt

We have developed a new robust concept for the calculation of the depth of investigation (DOI) for inversion problems described by several intrinsic parameters, like the spectral inversion of time-domain induced polarization data or the inversion of full-decay Nuclear Magnetic Resonance soundings. A calculation of the DOI is crucial for interpreting the geophysical models, as the validity of the model varies considerably with data noise and parameter distribution. Without the DOI estimate, it is difficult to judge when the information in the model is data-driven or is strongly dependent on the constraints and/or on the starting value. The proposed method is based on an approximated covariance analysis applied to the model output from the inversion while considering the data standard deviations. Furthermore, the crosscorrelations between intrinsic parameters are taken into account in the computations, which is crucial when strong cross-correlations are expected. The new DOI estimate is described in detail and compared to the full covariance analysis on the model parameters using 2D spectral inversion of time-domain induced polarization data as an example. The DOI presented here behaves as anticipated on a synthetic model and is suggested as a general approach for model-spaces with more than one physical parameter.

OriginalsprogEngelsk
TitelNear Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics
ForlagEuropean Association of Geoscientists and Engineers, EAGE
Sider666-670
Antal sider5
ISBN (Elektronisk)9781510814127
DOI
StatusUdgivet - 2015
Begivenhed21st European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2015 - Turin, Italien
Varighed: 6 sep. 201510 sep. 2015

Publikationsserier

NavnNear Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics

Konference

Konference21st European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2015
Land/OmrådeItalien
ByTurin
Periode6/09/1510/09/15

Programområde

  • Programområde 2: Vandressourcer

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